Tachycardia vs. Bradycardia

Tachycardianoun

A rapid resting heart rate, especially one above 100 beats per minute.

Tachycardianoun

abnormally rapid heartbeat (over 100 beats per minute)

Tachycardia

Tachycardia, also called tachyarrhythmia, is a heart rate that exceeds the normal resting rate. In general, a resting heart rate over 100 beats per minute is accepted as tachycardia in adults.

Bradycardianoun

The condition of having a slow heartbeat, defined as under 60 beats per minute for an adult.

Bradycardianoun

abnormally slow heartbeat

Bradycardianoun

abnormally slow heart action.

Bradycardia

Bradycardia is a condition typically defined wherein an individual has a resting heart rate of under 60 beats per minute (BPM) in adults, although some studies use a heart rate of less than 50 BPM. Bradycardia typically does not cause symptoms until the rate drops below 50 BPM. When symptomatic, it may cause fatigue, weakness, dizziness, sweating, and at very low rates, fainting.During sleep, a slow heartbeat with rates around 40–50 BPM is common, and is considered normal. Highly trained athletes may also have athletic heart syndrome, a very slow resting heart rate that occurs as a sport adaptation and helps prevent tachycardia during training.The term is used to refer to a heart rate that, although not actually below 60 BPM, is still considered too slow for the individual's current medical condition.